Represents an ‘else` clause in a `case`, `if`, or `unless` statement.
if a then b else c end
^^^^^^^^^^
attr_reader statements: StatementsNode?
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 6175
def initialize(source, else_keyword_loc, statements, end_keyword_loc, location)
@source = source
@location = location
@else_keyword_loc = else_keyword_loc
@statements = statements
@end_keyword_loc = end_keyword_loc
end
def initialize: (Location else_keyword_loc, StatementsNode? statements, Location? end_keyword_loc, Location location) -> void
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 6280
def self.type
:else_node
end
Similar to type, this method returns a symbol that you can use for splitting on the type of the node without having to do a long === chain. Note that like type, it will still be slower than using == for a single class, but should be faster in a case statement or an array comparison.
def self.type: () -> Symbol
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 6286
def ===(other)
other.is_a?(ElseNode) &&
(else_keyword_loc.nil? == other.else_keyword_loc.nil?) &&
(statements === other.statements) &&
(end_keyword_loc.nil? == other.end_keyword_loc.nil?)
end
Implements case-equality for the node. This is effectively == but without comparing the value of locations. Locations are checked only for presence.
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 6184
def accept(visitor)
visitor.visit_else_node(self)
end
def accept: (Visitor visitor) -> void
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 6189
def child_nodes
[statements]
end
def child_nodes: () -> Array[nil | Node]
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 6201
def comment_targets
[else_keyword_loc, *statements, *end_keyword_loc] #: Array[Prism::node | Location]
end
def comment_targets: () -> Array[Node | Location]
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 6194
def compact_child_nodes
compact = [] #: Array[Prism::node]
compact << statements if statements
compact
end
def compact_child_nodes: () -> Array
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 6206
def copy(else_keyword_loc: self.else_keyword_loc, statements: self.statements, end_keyword_loc: self.end_keyword_loc, location: self.location)
ElseNode.new(source, else_keyword_loc, statements, end_keyword_loc, location)
end
def copy: (?else_keyword_loc: Location, ?statements: StatementsNode?, ?end_keyword_loc: Location?, ?location: Location) -> ElseNode
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 6214
def deconstruct_keys(keys)
{ else_keyword_loc: else_keyword_loc, statements: statements, end_keyword_loc: end_keyword_loc, location: location }
end
def deconstruct_keys: (Array keys) -> { else_keyword_loc: Location, statements: StatementsNode?, end_keyword_loc: Location?, location: Location }
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 6242
def else_keyword
else_keyword_loc.slice
end
def else_keyword: () -> String
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 6219
def else_keyword_loc
location = @else_keyword_loc
return location if location.is_a?(Location)
@else_keyword_loc = Location.new(source, location >> 32, location & 0xFFFFFFFF)
end
attr_reader else_keyword_loc: Location
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 6247
def end_keyword
end_keyword_loc&.slice
end
def end_keyword: () -> String?
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 6229
def end_keyword_loc
location = @end_keyword_loc
case location
when nil
nil
when Location
location
else
@end_keyword_loc = Location.new(source, location >> 32, location & 0xFFFFFFFF)
end
end
attr_reader end_keyword_loc: Location?
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 6252
def inspect
InspectVisitor.compose(self)
end
def inspect -> String
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 6270
def type
:else_node
end
Sometimes you want to check an instance of a node against a list of classes to see what kind of behavior to perform. Usually this is done by calling ‘[cls1, cls2].include?(node.class)` or putting the node into a case statement and doing `case node; when cls1; when cls2; end`. Both of these approaches are relatively slow because of the constant lookups, method calls, and/or array allocations.
Instead, you can call type, which will return to you a symbol that you can use for comparison. This is faster than the other approaches because it uses a single integer comparison, but also because if you’re on CRuby you can take advantage of the fact that case statements with all symbol keys will use a jump table.
def type: () -> Symbol